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TitlePrecambrian bedrock geology, Southampton Island, Nunavut
DownloadDownloads
AuthorSanborn-Barrie, M; Chakungal, J; James, D T; Rayner, N; Whalen, J B
SourceGeological Survey of Canada, Canadian Geoscience Map 132, 2014, 1 sheet, https://doi.org/10.4095/293328
Year2014
Documentserial
Lang.English
Maps1 map
Map Info.geological, bedrock geology, structural features, 1:250,000
ProjectionUniversal Transverse Mercator Projection, zone 17 (NAD83)
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; shp; xls; xml
ProvinceNunavut
NTS46A; 46B; 46C; 46D; 46F
AreaSouthampton Island
Lat/Long WENS-87.0000 -80.0000 66.2500 63.7500
Subjectsstratigraphy; structural geology; bedrock geology; basement geology; igneous rocks; mafic rocks; diorites; granodiorites; metamorphic rocks; metasedimentary rocks; psammites; pelites; ironstone; granites; metamorphism; mineral potential; structural features; folds; faults; Precambrian; Proterozoic
Illustrationsphotographs
Viewing
Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramMultiple Metals - Cumberland Peninsula (Baffin Island, Nunavut), GEM: Geo-mapping for Energy and Minerals
Image
Released2014 05 28
AbstractSouthampton Island, Nunavut, is situated between the Archean-dominated western Churchill Province and the Paleoproterozoic Baffin-Ungava segment of the Trans-Hudson Orogen. The island exposes a highland of Precambrian basement across much of its eastern half and flat-lying Paleozoic carbonate strata across its western half. The Precambrian basement complex consists predominantly of 3000-2700 Ma tonalitegranodiorite-granite gneiss, containing enclaves and inclusions of ca. 3 Ga maficultramafic-anorthositic plutonic rocks and lesser metasedimentary rocks. A smaller proportion of Paleoproterozoic gabbroic and granitic plutons also occurs. These rocks experienced profound amphibolite- to granulite-facies tectono-metamorphic reworking at 1880-1820 Ma, during the Trans-Hudson Orogen collision between the Rae and Superior cratons, resulting in their strongly foliated to gneissic character, followed by exhumation and cooling at 1790-1780 Ma.
Summary(Plain Language Summary, not published)
This map portrays a new understanding of the Precambrian bedrock geology of Southampton Island, Nunavut. The island exposes Precambrian basement rocks in its eastern highlands and flat-lying Paleozoic carbonate strata in the west. The basement complex consists predominantly of 2.77-2.70 billion year old felsic gneiss, enclosing mafic-ultramafic-anorthositic plutonic rocks which date back to 3 billion years, as well as some metasedimentary rocks. These rocks were buried and heated 1.88 to 1.82 billion years ago, reflecting mountain-building in the collision zone between the Rae and Superior cratons- mountains that were subsequently deeply eroded.
GEOSCAN ID293328